sys/kern/subr_autoconf.c

   1 /*
   2  * Copyright (c) 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This software was developed by the Computer Systems Engineering group
   6  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
   7  * contributed to Berkeley.
   8  *
   9  * All advertising materials mentioning features or use of this software
  10  * must display the following acknowledgement:
  11  *      This product includes software developed by the University of
  12  *      California, Lawrence Berkeley Laboratories.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions
  16  * are met:
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  * 2. Redistributions in binary form must reproduce the above copyright
  20  *    notice, this list of conditions and the following disclaimer in the
  21  *    documentation and/or other materials provided with the distribution.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  *
  38  *      @(#)subr_autoconf.c     8.1 (Berkeley) 6/10/93
  39  *
  40  * $FreeBSD: src/sys/kern/subr_autoconf.c,v 1.14 1999/10/05 21:19:41 n_hibma Exp $
  41  * $DragonFly: src/sys/kern/subr_autoconf.c,v 1.9 2007/07/28 23:24:33 dillon Exp $
  42  */
  43
  44 #include <sys/param.h>
  45 #include <sys/kernel.h>
  46 #include <sys/systm.h>
  47 #include <sys/thread.h>
  48 #include <sys/thread2.h>
  49
  50 /*
  51  * Autoconfiguration subroutines.
  52  */
  53
  54 /*
  55  * "Interrupt driven config" functions.
  56  */
  57 static TAILQ_HEAD(, intr_config_hook) intr_config_hook_list =
  58         TAILQ_HEAD_INITIALIZER(intr_config_hook_list);
  59
  60
  61 /* ARGSUSED */
  62 static void run_interrupt_driven_config_hooks (void *dummy);
  63 static int ran_config_hooks;
  64
  65 static void
  66 run_interrupt_driven_config_hooks(void *dummy)
  67 {
  68         struct intr_config_hook *hook_entry;
  69         int waiting;
  70
  71         waiting = 0;
  72
  73         ran_config_hooks = 1;
  74         while (!TAILQ_EMPTY(&intr_config_hook_list)) {
  75                 TAILQ_FOREACH(hook_entry, &intr_config_hook_list, ich_links) {
  76                         if (hook_entry->ich_ran == 0) {
  77                                 hook_entry->ich_ran = 1;
  78                                 (*hook_entry->ich_func)(hook_entry->ich_arg);
  79                                 break;
  80                         }
  81                 }
  82                 if (hook_entry)
  83                         continue;
  84                 if (TAILQ_EMPTY(&intr_config_hook_list))
  85                         break;
  86
  87                 if (waiting >= 20 && (waiting % 10) == 0) {
  88                         crit_enter();
  89                         kprintf("**WARNING** waiting for the following device "
  90                                 "to finish configuring:\n");
  91                         TAILQ_FOREACH(hook_entry, &intr_config_hook_list,
  92                                       ich_links) {
  93                             kprintf("  %s:\tfunc=%p arg=%p\n",
  94                                 (hook_entry->ich_desc ?
  95                                     hook_entry->ich_desc : "?"),
  96                                 hook_entry->ich_func,
  97                                 hook_entry->ich_arg);
  98                         }
  99                         crit_exit();
 100                         if (waiting >= 60) {
 101                                 kprintf("Giving up, interrupt routing is "
 102                                         "probably hosed\n");
 103                                 break;
 104                         }
 105                 }
 106                 tsleep(&intr_config_hook_list, 0, "conifhk", hz);
 107                 ++waiting;
 108         }
 109 }
 110 SYSINIT(intr_config_hooks, SI_SUB_INT_CONFIG_HOOKS, SI_ORDER_FIRST,
 111         run_interrupt_driven_config_hooks, NULL)
 112
 113 /*
 114  * Register a hook that will be called after "cold"
 115  * autoconfiguration is complete and interrupts can
 116  * be used to complete initialization.
 117  */
 118 int
 119 config_intrhook_establish(struct intr_config_hook *hook)
 120 {
 121         struct intr_config_hook *hook_entry;
 122
 123         for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
 124              hook_entry != NULL;
 125              hook_entry = TAILQ_NEXT(hook_entry, ich_links)) {
 126                 if (hook_entry == hook)
 127                         break;
 128                 if (hook_entry->ich_order > hook->ich_order)
 129                         break;
 130         }
 131         if (hook_entry == hook) {
 132                 kprintf("config_intrhook_establish: establishing an "
 133                        "already established hook.\n");
 134                 return (1);
 135         }
 136         hook->ich_ran = 0;
 137         if (hook_entry)
 138                 TAILQ_INSERT_BEFORE(hook_entry, hook, ich_links);
 139         else
 140                 TAILQ_INSERT_TAIL(&intr_config_hook_list, hook, ich_links);
 141
 142         /*
 143          * Late hook, run immediately.
 144          */
 145         if (ran_config_hooks)
 146                 run_interrupt_driven_config_hooks(NULL);
 147         return (0);
 148 }
 149
 150 void
 151 config_intrhook_disestablish(struct intr_config_hook *hook)
 152 {
 153         struct intr_config_hook *hook_entry;
 154
 155         for (hook_entry = TAILQ_FIRST(&intr_config_hook_list);
 156              hook_entry != NULL;
 157              hook_entry = TAILQ_NEXT(hook_entry, ich_links))
 158                 if (hook_entry == hook)
 159                         break;
 160         if (hook_entry == NULL)
 161                 panic("config_intrhook_disestablish: disestablishing an "
 162                     "unestablished hook");
 163
 164         TAILQ_REMOVE(&intr_config_hook_list, hook, ich_links);
 165         /* Wakeup anyone watching the list */
 166         wakeup(&intr_config_hook_list);
 167 }